GRAND RAPIDS, Mich. (WOOD) — More criminal charges connected to the Flint water crisis are expected to be announced Friday.

Michigan Attorney General Bill Schuette is expected to announce charges at 11:30 a.m. at the University of Michigan Flint campus. Special Counsel Todd Flood and the Flint Water Investigative Team will also be attendance.

It’s not yet known how many people will face charges or how serious those charges will be.

Three people have so far been charged in connection to the crisis: two employees of the Michigan Department of Environmental Quality and a Flint worker.

After the city switched to the Flint River for its water in 2014 in an effort to save money, the highly corrosive water caused lead from old pipes to leach into the water and into people’s homes. Flint switched back to Detroit’s system for its water last fall, but the problem persisted.

However, things are getting better. Federal authorities said last month it was safe for everyone in Flint to drink the tap water as long as it is filtered.